Process of calico-printing.



I citizen of the British "Empire, residingat face of the resist print, even where the printvented new and useful Improvements in prepared, or with similar printing colors in either case being that where the sulfur tained in the latter is fixed upon the fiber.

outrun. STATES ATENT OFFICE.

FABRIKEN VORM. FRIEDR. BAYER 'IION 0F GI: RMANY.

No Drawing;

To all whom itmay concern: 1

Be it known that I. Fnnnnmci DAVIS,

Vviswell, near Whalley, England, have in- Processes of Calico-Printing, of which the following is a specification.

This invention relates to improvements in calico printing and has for its object to produce certain novel colored resist effects in printing indigo and other vat colors. In carrying my invention into effect I may or may not prepare the cloth with glucose in the ordinary way for indigo printing. I then print with a resist paste containing siilfur, such as is ordinarily used for producing a white resist effect under printed indigo, to which I add a sulfur color, or a suitable vat dyestuffl' or mixture of the same. I then print, pador otherwise cover with any suitable indigo printing color, for instance the customary color containing indigo and caustic alkali when the cloth is prepared with glucose, or the customary color containing indigo, caustic alkali and a suitable hydrosulfite when the cloth is not so prepared from other vat dyes, or mixtures thereof, the final result after development resist is printed the fixation of indigo blue or other printing color is prevented. while where the printing color falls upon the sulfur resist color the coloring matter con- This novel and useful effect is, I believe, due to the combination of two well known eifectsthe resisting action of sulfur on indigo, or other printing color, and the fixation of sulfur colors by the simultaneous action of alkali and sulfur under suitable conditions, the fixation being presumably due to the intermediate formation of alkali sulfids. I

If it is desired to fix the sulfur or other color as above indicated all over the suring color does not fall upon it, I add a suitable alkali, such as carbonate of potash or soda, to the sulfur resist color mix'ture. I then age or steam, wash and otherwise treat I the cloth in-the usual way.

FREDERICK DAVIS, OF WISWELL, NEAR WHALLEY, ENGLAND, ASSIGNOR TO FARBEN- & CO., OF ELBERFELD, GERMANY, A CORPORA- PROCESS OF CALICO-YRINTING.

I Specification of Letters Patent. Application filed July 25, 1909. Serial rm. 510,142.

Patented Feb. 21, 1911.

The dyestuffs which can be a plied for the purpose of my invention ma lie divided into two classes-resist dyes an cover dyes. The resist dyes are characterized by the fact that they are capable of fixation by the simultaneous action of sulfur and alkali. The

cover dyes are characterized by the fact that they are sufficiently resisted by sulfur to permit of obtaining good coloredresist effects by my process. For that purpose it isnot necessary that they should be resisted coni- I have found that all the so-called vat colors, more particularly the indanthrene, algol and ciba colors,.'also the thionaphthene colors,-are suitable as cover colors and can be used in my procem in place of indigo in the cover and as reslst dyes I may employ especially the sulfur-colors, such as'kntigen green, katigen blue, katigen. olive, etc, the algol-colors, particularly algol green an'd algol blue, the indigo-colors, especially the thio indigoes and bromin derivatives etc; the difierence between cover and resist dyes in my process being that the lattl; must be capable of fixation by the simultaneous-action of sulfur and alkali, while practically all vat colors are available as cover dves.

I claim:

1. In the art of producing variegated colored efi'ects by means of vat dyestufis, the process consisting of first printing resists on the fabric which comprise sulfur, sulfur colors-and alsuitable alkali, then covering the fiber with suitable vat dyes and finally finishing the goods in the usual manner, substantially as described.

2. In ,the art of producing variegated colored effects by means of vat dyestuffs the process consisting of first printing resists on the fabric which comprise sulfur, sult'ur colors, vat dyestuffs an a suitable alkali, then covering the fiber with suitable vat usual manner, substantially as described:

In testimony whereof I have hereunto set my hand in the presence of two subscribing dves and finally finishing the goodsin *the 

